Waste less time on Facebook — follow Brilliant.

×

Need Your Help!

A motor boat, moving upstream passess a drifting raft. 1 hour later, the boat's motor breaks. it takes 45 min to fix it. while the boat is drifting downstream. after that, the boat begins to chase the raft and passes it. \(S=11 \text{ km}\) away from the place where they met first. What is the current \(v\) of the river.